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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Net income, Gross $ 114,759 $ 69,890
Unrealized holding gains (losses) during the period, Gross 65,925 (261,832)
Unrealized gains (losses) on securities with credit loss recognized in earnings; Gross 22,431 (86,621)
Amounts reclassified into net income: HTM securities, Gross   1
Amounts reclassified into net income: net realized (gains) losses on disposals and intent-to-sell AFS securities, Gross 6,104 15,991
Amounts reclassified into net income: Credit loss (benefit) expense, gross (9,529) 22,052
Total unrealized gains (losses) on investment securities, Gross 84,931 (310,409)
Amount reclassified into net income: Net actuarial (gain) loss, Gross 757 417
Total defined benefit pension and post-retirement benefit plans, Gross 757 417
Other comprehensive income (loss), Gross 85,688 (309,992)
Comprehensive income (loss) before tax 200,447 (240,102)
Net income, Tax 22,185 13,560
Unrealized holding gains (losses) during the period, Tax 13,846 (54,984)
Unrealized gains (losses) on securities with credit loss recognized in earnings; Tax 4,710 (18,191)
Amounts reclassified into net income: HTM securities, Tax   0
Amounts reclassified into net income: net realized (gains) losses on disposals and intent-to-sell AFS securities, tax 1,282 3,358
Amounts reclassified into net income: Credit loss (benefit) expense, Tax (2,002) 4,631
Total unrealized gains (losses) on investment securities, Tax 17,836 (65,186)
Amount reclassified into net income: Net actuarial (gain) loss, Tax 159 88
Total defined benefit pension and post-retirement benefit plans, Tax 159 88
Other comprehensive (loss) income, Tax 17,995 (65,098)
Comprehensive income (loss), Tax 40,180 (51,538)
Net income 92,574 56,330
Unrealized holding gains (losses) during period, net 52,079 (206,848)
Unrealized gains (losses) on securities with credit loss recognized in earnings, net 17,721 (68,430)
Amounts reclassified into net income: HTM Securities, net 0 1
Amounts reclassified into net income: net realized (gains) losses on disposals and intent-to-sell AFS securities, net 4,822 12,633
Amounts reclassified into net income: Credit loss (benefit) expense, net (7,527) 17,421
Total Unrealized Gains (Losses) on Investment Securities, Net 67,095 (245,223)
Amount reclassified into net income: Net actuarial (gain) loss, Net 598 329
Total defined benefit pension and post-retirement plans, Net 598 329
Other Comprehensive income (loss) 67,693 (244,894)
Comprehensive Income (Loss), Net $ (160,267) $ 188,564